Scroll Compressor Oil Relief Passage Stabilizes Movable Scroll
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Solution Overview
Problem
The existing scroll compressor designs face instability in the behavior of the movable scroll due to fluctuations in lubricating oil pressure, leading to either excessive friction loss or insufficient pressing force, which can result in overturn motion and unstable operation.
Innovation Solution
The scroll compressor incorporates an adjustment mechanism with an oil inflow groove and an oil relief passage, where high-pressure lubricating oil flows into a low-pressure space during specific angular ranges, adjusting the push-back force to balance the pressing force and prevent overturn motion, thereby stabilizing the movable scroll's behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high-pressure lubricating oil is supplied to the oil inflow groove to generate push-back force, then the movable scroll is pushed back against the pressing force, but the pressure in the oil inflow groove decreases and excessive pressing causes friction loss
Solution Approach 1:
The oil relief passage is configured to communicate with the oil inflow groove only in a specific angular range during the eccentric rotational motion of the movable scroll. This periodic communication allows high-pressure lubricating oil to be supplied to reduce push-back force when needed, while maintaining normal oil pressure in other angular ranges, thereby preventing both insufficient pressing and excessive friction loss throughout the rotation cycle.
2Loss of energy
If oil is supplied into the oil inflow groove in a limited manner, then the push-back force is reduced, but the pressing force becomes insufficient and an overturn motion may occur
Solution Approach 1:
The oil relief passage communicates with the oil inflow groove periodically during the eccentric rotation, specifically in a predetermined angular range. This periodic oil supply limitation ensures that pressing force is maintained during critical angular ranges to prevent overturn motion, while allowing push-back force reduction in other ranges to minimize friction loss, thereby stabilizing the movable scroll's behavior throughout the rotation cycle.
3Ease of manufacture
If oil is supplied into the suction chamber before compression, then lubrication is provided, but a large amount of lubricating oil flows into the suction chamber causing pressure decrease in the oil inflow groove
Solution Approach 1:
Instead of continuously supplying oil to the suction chamber, the oil relief passage is configured to communicate with the oil inflow groove only in a predetermined angular range during eccentric rotation. This periodic oil release provides necessary lubrication to the suction chamber while controlling the amount of oil flow, thereby maintaining adequate pressure in the oil inflow groove to generate sufficient push-back force when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively stabilizes the movable scroll's behavior by adjusting the push-back force to prevent both insufficient pressing and excessive friction loss, ensuring consistent operation by balancing the pressing and push-back forces across different rotational positions.
Implementation Method 1
high-pressure lubricating oil flows into a low-pressure space through the oil relief passage
Implementation Method 2
lubricating oil flows into the suction chamber through the communication portion
Data Source
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AI summary
In a scroll compressor, the discharge timing of a first compression chamber (S21) on the inner peripheral side of a fixed-side wrap (62) is different from the discharge timing of a second compression chamber (S22) on the outer peripheral side of the fixed-side wrap (62). The scroll compressor includes an oil inflow groove (80) in a sliding surface (A1, A2) of a fixed-side end plate (61) or a movable-side end plate (71). The scroll compressor is provided with an oil relief passage (83) that allows the oil inflow groove (80), which is formed in the sliding surface (A1, A2) of the end plate (61, 71), to communicate with a low-pressure space (S1) in order to stabilize the behavior of the movable scroll (70) in a predetermined angular range (α). The predetermined angular range (α) is from a discharge start point (D1) of the first compression chamber (S21) and a discharge start point (D1) of the second compression chamber (S22) to the discharge start of the second compression chamber (S22).